Oxygen-selective adsorption in RPM3-Zn metal organic framework

摘要: Abstract Development of an oxygen selective adsorbent is anticipated to reduce the material and energy requirements for adsorptive separations air by a factor four, due relative concentrations N 2 O in air, thereby decreasing parasitic losses, carbon dioxide emissions, cost purification via pressure-swing adsorption. Here, we report that RPM3-Zn (a.k.a. Zn (bpdc) (bpee); bpdc = 4,4′-biphenyldicarboxylate; bpee = 1,2-bipyridylethene) over nitrogen at temperatures from 77 K 273 K, although capacity sorbent decreased markedly increasing temperatures. Due diffusivity ∼1000-fold greater than nitrogen, effective selectivity increases near infinity low temperature equal contact times mass transfer limitations gate-opening. The kinetic limitation open structure has sharp dependence, suggesting this may be “tuned in” other flexible metal-organic-frameworks. Although not practical displace cryogenic distillation, results suggest new mechanism tailoring materials selectivity, namely, capitalizing upon delayed opening process particular gas another.